PDF BA7796FS Data sheet ( Hoja de datos )

Número de pieza	BA7796FS
Descripción	VCR standard audio signal processor
Fabricantes	ROHM Semiconductor
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No Preview Available ! Video ICs VCR standard audio signal processor BA7796FS The BA7796FS is a standard audio signal processor designed for use in VCRs and tape decks. The circuit is com- prised of a playback preamplifier, a line amplifier, a recording amplifier, an ALC circuit, an EQ switch, and high-volt- age head switch. The IC has three input switching systems, and a built-in coil equivalent circuit for recording equalization, which elimi- nates the need for an external component. •Applications Video cassette recorders and tape decks •Features 1) Three input switching systems built-in (LINE1, LINE2, and TUNER). 2) Built-in coil equivalent circuit for recording equaliza- tion. 3) Two-mode EQ switch. 4) High-performance low-noise playback amplifier. 5) Fixed ALC level ( – 7.2dB when VCC = 12V). 6) Phase-inverting recording amplifier. •Absolute maximum ratings (Ta = 25°C) Parameter Symbol Limits Power supply voltage Power dissipation VCC 13 Pd 800∗ Operating temperature Topr – 10 ~ + 65 Storage temperature Tstg – 55 ~ + 125 ∗ When mounted on a 90mm × 50mm × 1.6mm glass epoxy board. Reduced by 8.0mW for each increase in Ta of 1°C over 25°C. Unit V mW °C °C •Recommended operating conditions (Ta = 25°C) Parameter Symbol Min. Typ. Power supply voltage VCC 7.5 — Max. 12.5 Unit V 1 1 page Video ICs BA7796FS •Electrical characteristics (unless otherwise noted, Ta = 25°C, VCC = 12V, and f = 1kHz) Parameter Quiescent current EE Symbol Min. Typ. Max. Unit Conditions IqEE 7.4 9.8 13.0 mA No signal input Measurement circuit Fig.1 Quiescent current PB IqPB 7.4 9.8 13.0 mA No signal input Fig.1 Quiescent current REC IqREC 6.4 8.4 11.2 mA No signal input Fig.1 〈Line amplifier〉 Voltage gain (PB input) GVCLP 27.0 28.0 29.0 dB VO = – 8dBV Fig.1 Voltage gain (LINE1, LINE2, TU inputs) GVCLT 19.0 Distortion THDLT — Maximum output level VOmLT 7.3 20.0 0.1 10.5 21.0 0.3 — dB VO = – 8dBV % VO = – 8dBV, RL = 4.7kΩ∗ dBV THD = 1%, RL = 4.7kΩ∗ Fig.1 Fig.1 Fig.1 Output residual noise VNOLT — – 81.5 – 75 dBV Rg = 4.7kΩ, DIN AUDIO Fig.1 ALC level ALC distortion VOA – 8.2 – 7.2 – 6.2 THDA — 0.1 0.5 dBV VIN = – 25dBV % VIN = – 25dBV, RL = 4.7kΩ∗ Fig.1 Fig.1 Mute attenuation ratio MT — – 82.0 – 72 dB VO = 0dBV, DIN AUDIO Fig.1 〈Recording amplifier〉 Voltage gain GVCR 19.0 20.0 21.0 dB LINE1, LINE2, TUNER→REC OUT Fig.1 Distortion Maximum output level Openloop gain THDR — 0.13 0.4 % VO = – 8dBV VOmR 7.0 10.0 — dBV VO = – 8dBV, RL = 4.7kΩ∗ GVOR 60 71 — dB THD = 1% , RL = 4.7kΩ∗ Fig.1 Fig.1 Fig.1 〈Playback preamplifier〉 Openloop gain GVOP 61 68 — dB — Fig.1 Input conversion noise VNINP — – 122.5 – 114 dBV Rg = 680Ω, DIN AUDIO Fig.1 Voltage gain (stand alone, SP mode) GVCP 35.0 36.0 37.0 dB PB IN→PB OUT Fig.1 〈Head switch〉 PB head switch impedance RPH — 11 20 Ω — Fig.1 REC head switch impedance RRH — 11 20 Ω — Fig.1 REC head switch DC withstanding voltage BVRHDC — 0 10 µA E3 = ± 55V Fig.1 REC head switch AC withstanding voltage BVRHAC 80 100 — VP-P f = 70kHz, V3 Ϲ ± 1.5V ∗ Measured at BW = 0.4 to 30kHz. Fig.2 5 5 Page

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